4 Parser C-Language Interface

The Bison parser is actually a C function named yyparse. Here we
describe the interface conventions of yyparse and the other
functions that it needs to use.

Keep in mind that the parser uses many C identifiers starting with
‘yy’ and ‘YY’ for internal purposes. If you use such an
identifier (aside from those in this manual) in an action or in epilogue
in the grammar file, you are likely to run into trouble.